Side-tooth dresser for saws.



v following is a specification.

Naf/edite.

d UNITED STATES Patented Mayv 15, `1904i PATENT. (Finora,v y

slpE-'TooTi-i DREssER FoFi'sAws'. .,f"

SPECIFICATION -forming part' of Letters recent No. 760,198, dated May 17, 1994.' i

' .Application filed .im 18,1902. serial No. 112,1i5.` N0 model.) p

Toy all whom it may concern,.-

Be it known that I, JOHN HAReREAvEs, a-

delphia, county vof Philadelphia, and State of Pennsylvania, havev invented a certain new and useful Improvement in Side-Tooth Dressers for Band and Gang Saws, of which the Myinvention relates to a new and useful improvementin side-tooth dressers for band and gang saws, and has for -its object .to provide an implement of this character which -will dress the kSides of the saw-teeth uniformly vand evenly upon each side after the saw-teeth havebeen swaged;

With this` endv in view this invention con-Y sistysin lthe details of construction andcombiriationof elements hereinafter set forth and then specifically designated by the. claims.

In order that those skilled in the art to vwhich this invention appertains may understand how to make and use the same, the construction andv operation will now be described in detaiL-referringto the accompanying drawings,.forming a part of this specification, in whi'chp' v l Figure 1 is Va perspective view -of, myinlvention; Fig. 2, a longitudinal vertical section through the same; Fig. 3, a bottom plan view of the forward or operating portion of the device; Fig. 4, a section taken on the line 4 4 of Fig.` 3; Fig. 5, a plan view of the forward or operating part of the device, showing a modilication in which one of the rollers is adjustable; Fig. 6, a vertical cross-section on the line 6 6 of Fig. 5. Fig. 7 is a detail view of a roller, showing the cut-,away portions in the same, i

The non-adjustable construction of the implement, as shown in Figs. 1, 2,3, and 4, is made or' two parts A, which parts are identically the same and are placed face to face and separated by a gagefstrip B and a liner C.

Bolts D pass horizontally through the two.

parts and also through the gage-strip and liner and bind these several parts together. E repwhich the rollers E are journaled isisoI that a portion 'of the inner face of each Yof the parts A willV be cut away in ,the boring so as f base .of this .shoulder the cut-away portion merges into the true circle. This cut-away portion H in the rollers tapers from the lower end upward andiinward, sozas to give the proper shape to the tooth.. Thus vit will Abe seen that when the rollers are .-in -the .position shown in Fig. 3the distance between the rollers is the same as the rest y.of .the space between the parts A andthe saw can be easily inserted. B is the gage which is .clampedbetween the partsA, and against the nose Bf, of

the gage is adapted to be brought thetoot-h of the saw to be operatedfon, and this gage is set so that `the teeth 'will be broughtfin the proper position to be contacted on each side by f the rollers E. The gageis made adj ustable-by reason of the openings B2, throughwhichthe bolts D pass, being much larger than'. saidbolts,

thus'allowingfor both longitudinaland lateral movement, so as to make the adjustment unimesh withv one another,;and upon one oflthese 4squared shanks I is placed La wrench-handle K, by which the rollers are designed-.to berotated. Thus after the saw has been `properly i upon the upper ends are secured gears J,whieh '-f swaged the gage B is setso asfto bringthe toothof the saw to they proper .point in the implement between the rollers E.` Then the rollers are set, as sho-wn inFige'SQand-v the saw inserted between the parts A andl the first tooth of the saw is brought against the nose Bl of the gage. Then by turning the rollers in the direction of the arrow 4shown in Fig. 3 the rollers will be brought intofcontact with the saw-tooth upon each side and roll the excess of the bur formed by theswaging down to the predetermined gage, and the rollers being formed with a taper will "give the TOO proper taper to the tooth, so that the tooth will be in the desired shape when ground;

The advantage'of this invention is that the tooth of the saw is dressed the same upon each side, so that the saw when used will make an` even smooth cut through the wood. In other saw-dressers in which the tooth is dressed by compression the tooth is liable to be dressed more upon one side than the other, so that the saw will make an uneveneut; but in my invention this is impossible.

If it is more desirable to eut the bur from the tooth instead of rolling it, the two rollers E may be transposed, and then by turning the .rollers in the direction of the arrow in Fig.

3 the shoulders H will be brought in contact with the tooth, and these shoulders will form cutting edges to cut the excess bur from 'the tooth instead of rolling; but I have found by experiment that the rolling is much more preferable, as it rolls the metal forward, so as to give a greater body of metal at the face of the tooth, and the tooth can then be ground Several times without again reswaging.

n The operation of the device, as shown in Figs. l, 2, 3, and 4,'is as follows: The appliance is placed above the saw, the saw entering the space in between the two halves. One of the teeth coming in contact with the nose B of the gage-strip B will prevent any movement of the s'aw when that tooth is being set, as the revolution of the rollers will tend to press the saw against the gage-strip. The rollers E being beveled from the bottom upward and inward, as shown in Fig. 4L, will give the desired shape or iiare to the tooth, the tooth being previously widened by the swaging process, and the cut-away portion H follows the outline of the roller, and therefore as the rollers are in the position shown in Fig. 3 they do not touch the tooth upon either side; but when the rollers are revolved so as to bring the concentric port-ion of the rollers against each sidef'of the tooth these rollers will roll the tooth tothe desired thickness and shape, and, if desired, the rollers may make one complete revolution; but, as shown in the drawings,one complete revolution could not be made unless the handle K was set up upon the shank I a suiicient distance so that the handie would clear the other shank I in turning; but it does not make any didier-ence whether the rollers make a complete revolution or only a partial one and are brought back with a retrograde movement to the position shown inFig. 3, and when in such a position the rollers are clear of the saw-teeth upon each side, so that the appliance may be moved to the next tooth.

In Figs. 5 and 6 I have shown a form where one of the rollers is made adjustable laterally, so. that in dressing saws of different gage the gage-strip B need not be replaced with a thinner or thicker one, but the same gage-strip can be used and the rollers adjusted. In this reales form I separate the parts with a gage-strip which is thick enough to accommodate saws of the thickest gage, and I journal one of the rollers E in a separate block L, which is held in one of the parts A. This block L is flanged at L at the top and bottom to prevent its vertical displacement. M represents set-screws threaded through the side of the part A containing the block L, so that said block can be forced toward the opposite roller when occasion requires. The gage-strip B in this instance is cutaway, as illustrated at B, to allow for the movement of this block L.

As the adjustment from the thinnest to the thickest gage of saws is a very small fraction of an inch, the gears J need not be changed, but the teeth of said gears will be long enough to allowfor this adjustment without bringing them out of mesh with one another.

Of course I do not wish to be limited tothe exact construction here shown, as slight modilications could be made without departing from the spirit of my invention.

Having thus fully described my invention, what I claim as new and useful is l. In a device of the character described, a two-part body divided vertically and longitudinally, a gage-strip clamped adjustably between said parts of the body., two rollers journaled vertically in the body, one roller in each part and arranged opposite one another, cutaway lportions inV said rollers merging into the true circle of the roller, said rollers tapering from the bottom upward and inward, and means for rotating said rollers simultaneously in opposite directions to one another, as and for the purpose specified.

2. In a device of the character described, a two-part body divided vertically and longitudnally, a gage-strip arranged between the parts of the body and adjustably clamped in place, two tapering rollers journaled vertically in said body, the bore in which said rollers are journaled extendingthroug-h the inner face of each of the parts of the body so that the true circle of the roller will extend into the-space between the parts of the body, cutaway portions in each of the rollers forming an abrupt shoulder and extending from the base of said shoulder and merging into the true circle of the roller, said cut-away portions being such that when brought opposite one another the distance between the rollers will be the same as the rest of the space between the two parts of the body, and means for rotating the two rollers simultaneously and in opposite directions to 011e another, as and for the purpose speciiied.

3. In a device of the character described, a two-part body, a gage-strip arranged between the two parts and ad justably clamped in place, a tapering roller journaled vertically in 011e part of the body, a block litted in the other part of the body opposite said roller, means for holding said block against vertical dis- IOO ISO

pering roller journaled vertically in each of said parts and opposite one anotherand adapted to extend into the slot between the-parts when rotated in a certain direction, vertical portions formed in each roller, one of said rollers having a fixed axis, the otherv roller being adjustable, and means for adjusting said movable roller toward or away from the other roller, and means for rotating both rollers simultaneously and in opposite direcp tions to one another, as specified.

In testimony whereof I have hereunto affixed my signature in the presence of two subscribing witnesses.

JOHN HARGREAvEs. y Witnesses:

H. B. HALLooK, `L. W. MORRISON. 

